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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff4bf174b6364babf5c2dbc5336d4869d915cd2f28893348d4c9b81d1e9f34d' 
  AND token = '5UB6TsY9uoDFsxCA67nnBhxww05c1oGLTxfz2Riidhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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