SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462931954c5eb11834acd7e9c430f3c3defda098b4047ab31fee20fa7e240dbf' 
  AND token = 'J1wqYF2vHHk9HhWTHYg7/NZ7h+hGztjHczKJn7ip1qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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