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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46792d90541582fc5e421a2200c476921f6ead4b0de937f1c71760334a87301a' 
  AND token = 'E6m+Am0FROq7QXElwRH8h7FoO9Fdfe6lQvAPcimliuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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