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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cf6d3dba0c4968119230e5f939e7bf12d71f776dcfacc7ad054942adb46e61' 
  AND token = 'bysOvoQNzqU3Ku/uPnNcNut2yQMmCs5hBRbC+40kg5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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