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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ca53b06e377f40abab955d2729ed15717209ff9dfb0b30f9f6151aaa922d69' 
  AND token = 'ooqBhOveJdD1q7yKou76pSKnYaJEIZP1sJoy50jeSF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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