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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af662ea47a5a0c1ea5deb355f78ed5de10e5605cf1aa386552ede3c6716e4536' 
  AND token = 'KsENCTp7UIQSRdydGTmBpH0FZH4QmC3bjp7NhS5n/5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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