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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d829d705d1fe34352929e1a6e3ea2a9c111c4142ea60bec6113816c46ccdad' 
  AND token = 'Mr/SZqz5o0IxK2TqsIDQn+67QbZmB8CkdNNOQYx+6/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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