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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4aacdfc1cb934b1d9acc39baed8b96dc7c3c7e3d2216cf7e586cf62162b81e8' 
  AND token = 'X+48IwaE+eGZegcUXYQ8incUJOuVRIN1cOjRiQ8OrsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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