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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cf17566539f6efcadf4f43c8b4b876c24a1c7799239e0924c2f5028f885635' 
  AND token = 'hcG2VVRGNOXTTmWs5dgSE1+2ikeWIOfiyAbsms4h250=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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