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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0279bec48430f216cd473508f0d08fc82c662cc0b9fc3ba84cc77911cf3ea6ea' 
  AND token = '1f8hZmSmbmapWhpjCaFOGNBBIN2oxGLf9poU5mCLEwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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