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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbc3e6007a445a0e710707a13d98456c434e73d1069fe8058183e79fba4da3d' 
  AND token = 'r+Xc3mgRx/ig8riwXqD+dMTHXTSzhxB3wpLJxbCwWPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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