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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71d3070034b250e60dd26deb87b855dc1dfd8c86cb5b5766bef9c187cea0a95' 
  AND token = 'waNmtBwG9ssSj7kC6nXXBTLdn8H0SeVeWJ4tSW/2rtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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