SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd23fc314e942e0737cbe8e9c7d111444fe7c002cf2a5162256f275c5b89d11b' 
  AND token = 'wT3aqE29vjYzTBUbHJWk7GrJlYp7zYrhwoADZRFbrDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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