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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1164deb59c3eb23a3a0dc38568f5d7a5267fe49369d03f3bd475d6e5f77fe48d' 
  AND token = 'KVkNqsYGvLtO4jMQmxswfILyjwm1fOW3OaTfDzrtXGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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