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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217e7f765ba37d299b383c07328a095aaf96b48133315bc116b1be86c53c86e4' 
  AND token = 'NqNBdm4lR62FODVGB7j3wkiNTAXeSeF+wOlCA4b4Bro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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