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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7c8405eec5360ad5306641a17154486ef1352f4d3f1516dccb5f5aad5c22c8' 
  AND token = 'HS0vpK3JmaD5kkDjNoynyB3bQLGc4ftfAZkvxOnZTyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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