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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026ee23b19102a40146245272d4f5ebfa6011b2d01e1fd07f7984ee66d1fc269' 
  AND token = '9SSIkY4OCXCi4qbgpRCAtAlU3PxEN1z9kCbSbnWo010=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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