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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63873b47ae1b22a9cc755f81a05027c5654839786db9e3d050f98d5a8e4cfe56' 
  AND token = 'xuIFmD/ktUVRuIy9X7x4vbHl/uPWF9f5XBsxRHuMt/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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