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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e1b88dd9efa6028348eebfb99734e0c3d1123af4184a6fea010511fa5b0822' 
  AND token = 'YbEorOQcFO4KzhK+8Y9v7MrUE3fIVGqkMWPkduclLMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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