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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef5a86165feb8a1bc007edff28fe716134dff755ab6389328a0a81c56c15c50' 
  AND token = 'k/128uxMQUmJi+5qJMSMxXNU93OE9Z+6xt31mJ7StiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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