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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db83bf03e922aa9c6e37ea8a0deb2bac9efb36c98a09a9d32637655527a4e28a' 
  AND token = 'ykXWZehVZFM9LdDmwBN6mH/jYRW+Rj96DGYGto+2fsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}