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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9166f73f20645fbf63380beee5e1b248e4ad6c7589e4c45a6836cba3fc37dc5c' 
  AND token = 'Pk8sboMGfJX88tK56sBB/Klbh/6b38ssHn5oFvP6mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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