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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ecded3e959b718c8e4dfc96984209b22405b2b7f2b000ae0c9a8396361a5a5' 
  AND token = '9ih7sVibcvMzLhCRAEI6/t3thBoI5jADpPNafqrliUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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