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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba1cc5e2616479e6ee7d24b345bf0cd4eeec2a65569375d44674440abfa5fa2' 
  AND token = 'J6mQQhWPY5+0kc5r80bHYlB6p9ChDT0wMi1nXOjuklI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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