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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347b1ccd25812b85c35e8969d7709308d2c33af4436298156b2255a060c85440' 
  AND token = 'ZjaIqL7EUukg7ys0PHaTdP1STn4wlf1wfGj4uPLp2Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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