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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e832ba30639f3a2804aff1523cc47b623ea2dcefee2963dd845d5ed8d44d4473' 
  AND token = 's/K4Ne1n5tdvdjggYv+MOX/grV2hEtTzxK0URDFyHSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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