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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac1717f6dd5cf9d4cb38ac198b24ffbfb5d3e38e9e433f7e6bb4f75cec05131' 
  AND token = '0hbW20V9PQ44CQny1UQ1E2xE9qx2I/jaH1TNLxOPXzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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