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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e6453c3f050eef5fadc50f0b1e0012c25f7612373cd504c419e717cbeb3307' 
  AND token = '9Bzuacpl2zHQSx6cHd0z6XD/iEnkL8PBVashWGEzyCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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