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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307ef600c4b95305957b44abe37f0eaea9c78dcf3128500a7ec58174cb64ad0f' 
  AND token = '8FdXtaAgHsw4PKDJD/h9BhTwv282nj0jd4pH7g8J6cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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