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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ccf0b3c731fa1b4938d9dd4661b8ea3d9ec5d05d2c3a4ad1be5b9cdb6bf76a' 
  AND token = 'lB+t0WxDbPC2d6NpQHtoviBWD0tpgwdKs8oc+Y0iXns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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