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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a444a60a4b6a7130c7461062191483be5083ac79d3e35faaf4e61998e99f30e4' 
  AND token = 'j8g6vPGZHfuuZWJ54xyLxclIJSm4ORQC9GLsEfTEFz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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