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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b01798c1c23c2358576163e81dda308ae5f3cf4cd09a285862ed112142a8ffa' 
  AND token = 'vt2oZRTzzWFvIxVH20K87IE6ow/a/9JU0IlZn6Cka7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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