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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae27c8a1d917d469e63d12e2cc94747918adcfc53f6d103c344bbd9eaad649c9' 
  AND token = 'Ifn1giCOAYyQQJXf/6ONFWSuU9e3qrsSot3C1uGlF0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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