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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08571ad71c24e48f96d867e678afb283898acf5d4fe259c7630d5ed6b0914c4' 
  AND token = 'NXe3eQkfkDopry/rFXNaZoOMAKmZQUwpESzqRmclzSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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