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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f28c8cc32f63ee8f283ae779b1d7d827868a9a6528d76c9d81cdc65ecba65e3' 
  AND token = 'Hp/ZXD1GMZc0Ghq0zDOfKVC/spaLF/aJjnATRFnL83s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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