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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95009eb7a7e20bd35373252b0cda41477ce557bcc886a885a7358a04f07a3f54' 
  AND token = 'DCuOp1BNlN/rfvCoXEBGrruxxOllkNTYnGsYylCHtv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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