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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572fa0f5890779c81806a787741f6b4343747e76ae98fee258f55d14b45ec1c6' 
  AND token = '5huCfKA1C2N8VTjGfccHIQgAXGHRS8X8KWz+FvH515Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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