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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e985cb8f9239835cb8dfd443953a303fcd0613cd5956c4f02f2e327aad01dc7' 
  AND token = 'OCvoUFZFFEDIt160W2o5L8glCSSkXdD5Q8xdD1YPg8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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