SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9779410f90965d7d3c380d919df5cf07eee84521ba43574191dbe1b573ec66' 
  AND token = 'ZGnDAr8GnJ6JwXrvEGWq2FXB8Hdc1XyfC28JjKtzBBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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