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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5e4ea618bfce9113cb8cdd0b2e72f01240520cd00831f9ab43d50dd3bf0449' 
  AND token = 'bYhbBdCYsehr+nI0alBOQt23Qu2Su/tSP8cUc+thrWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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