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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2c576e3b7b76c8d14ddfd439db0c64cea9a1c2c854acddb8f309d7ffad456b' 
  AND token = 'G/VT3wB6U9NiFrNzRD9oG0YlyQFTEaIWpZu2E91O+CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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