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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986b8b4abf5961823c90ba1257ce7bd07a283d0f39cb71e358a64fb5224acf8d' 
  AND token = '4c8yG3NpO+Um5kDe8lm11ow9kftX1Rz3Yh5jMfiGSp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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