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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb66cb6607623e486a322af0d7d7735ab7dc8e25b7fb940ffd48ff73d63b0340' 
  AND token = '9j7WWUXhcDNPyVCb5Wp0fB62lWCjnVQ/VBnZh6PGJtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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