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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2442fd56038f4832be9b916e64eea40a8c0fb26902ce92970653d80dda410b15' 
  AND token = 'vRnvhiJGQ9sif0xhhYKXMvotiHo2ejKST19WMGakoY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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