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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deea6871ad1beff85aadecdd35d069e245baf39d9c9df4df16726cfe6ed1e32f' 
  AND token = 'zd6yVk2Vty08fBDp8YcaQAhUV7fqB9vMIXyp9E/89CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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