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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3650bccfbb5f6071a34bd3e547dd31e09567b82de76ae201bc0cf121dc8392e' 
  AND token = '7WLTHynxazYYT7zHl6LXXJ1xO7RnQtyZvU3B3rrs21I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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