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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5546db3297ba969a7526ed795aad6cc8beb84b64012c4c45b804e0be5bd2014' 
  AND token = '5uaVp7PMNTKK30eKMFD/eU+TV+Q3G42lyGRU7znPcBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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