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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b02488d1389680bf4d2637d087bb039d289d8e21f255b47cb3acc291238fe95' 
  AND token = 'jmAspDFd7bNCYTLlPPD96IrMLBPljBMnkRw7tdiMXjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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