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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8e57efa713c95f6a8aaddf2843000c576b1e64e02f71f1087a86e564577d38' 
  AND token = 'tmvDxkn9ujI/ToEu0/ff2VleaOyiyrdo9ITL4Fdn3oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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