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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b20452a32a1f02454e62061d6c097ebf16920d978b3bcd5f337575c4e149415' 
  AND token = 'l+ST8t7r1cax/GJlg/D4BN2fvKhNTEscnNPdpsCeYvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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