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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460a1a3474e22ad20945e9024b0be28a4c572c9cdd27421ede6225daea56e6e6' 
  AND token = 'deY8jwb7urGWmmxB2Ir4cBjq41OA5V5IzyC8O8CVxMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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