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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83be931c6d431b20601d21facad1b141cb92064f797950ce39f87f2535c7aa77' 
  AND token = 'rdyctPaZTXqNVb6U+7Vpa7XzOZqmPL2QNbb1sJl/5NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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