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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402874e371d3f23cd454efa77c723b1f57603053c75db432221e7d9958479c97' 
  AND token = 'v6QkDmtAQD+Trteo7rTS0IdMw3WHSOj6prsIVH8/IC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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