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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dad854904639e76e4bf8471d43fc826b66859a6f66160ed7fe68c667b9bc48' 
  AND token = 'aw+4b616jLrG/8BJblRktpLQXeQ523QEykI0WxgWMYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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