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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c4f40f6d7ad51bbf16a6b275824581eed63ec647066e3150bc1a4af26f4576' 
  AND token = 'G+dCEa+mLy/aVj/h/H3XzpyFGxQ1L2mKWDAJAUdK+8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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