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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5641c4a86fe957cc855ef7f1d6ab4e5ee192a11526a47e19dba46b3362fd6aa3' 
  AND token = 'LQw0h95pg4Zt9uHMN+pP1dTkHBMH2QIxPvuWrpsHhU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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