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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8718dba82a95e73ad05f2362f88c8d2c7c75db426d1b2bab735c5b78079101ed' 
  AND token = 'o2biAAfMK8pzO8238DIs81hX4Rq8qwuDLPOiND8S57E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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