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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a089a7f80bb32f5b539ab8ed00aedd2d0f12c02bd02039cc206cc5a65f30db7' 
  AND token = '7FTWs5vav4gRky6Xl6RbkIEjQaHb9ifCzep1RWNviho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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