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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490ee6970a6c83e7bbb9935eecdc6f973090c5a800f849595f4253accaa78ba1' 
  AND token = 'wiYDrqyWJ2dQWhEoMiKFsswA6etfqjvww8XDHYILOg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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