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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2b0fa85105c6a91538f155c48155d54190830ccca71699e14661e9bc54d6ad' 
  AND token = 'WLFDCgoeo6Fck9FUUXKCcy2FeNLF9qUB5TkBUvdLawE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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