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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f9ee884c89546ee3ab41623f999bfde0865f64e9c55ea33a66983557b46482' 
  AND token = '1Lf/jCW96TNinaSEJ2fFzSccqf5HrO8MEZP10vALToM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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