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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00596bfe2ef83f2c203869413b07b7fb73f1878aced3b36b5507502fdc9396dd' 
  AND token = 'mBr7MZcdy5d+AyUnEdP0nVg2LMcet/KW/yuSDxfCILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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