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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686d60796529e9c01f8fa390e65e5657977d4d81d4f0122ce47f79ca4015cacd' 
  AND token = '2nWg55c3dSAhBH6cVnDmWAoRYzwUvITXoL4cf6mkHFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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