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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96568a445c8b3db067bba407d8149183a05a1e69cc09da30a2e939ca5f99a8b7' 
  AND token = 'lGd9YyUz/fVns/7WwK1hwMW2XAs904IPrZEqY9L3rH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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