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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fbedf821f014779552c75f3e553b3446f343ebb48bbfc0e8b7b5fdeb6e21ff' 
  AND token = 'Xmcgr9vRZ9jKU8bmIm0NMAHOtom/aIWDFcWBnrVLQLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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