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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67843a6390d46fc40b2808fb94df539aeb3f1fd0153e69698e336dafec2dbff4' 
  AND token = 'w2J9rbi7MYR/Nerco0y5SJZxWd/oP27pOI2vW2e5l3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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