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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e60f58c720bc774e13604bde4d4b38875ac7c6bbdfe7fa190caf9787e4f4074' 
  AND token = '4L+xHYQG56h7d/UOZkDScaNF/15VWjyshkKNw6T57jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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