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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c42f4233ee2862f8be9ddbea0c44f91601b4480542eb412a51c86296264c7f' 
  AND token = 'BGCKe/5sxQLl8uVwbW6LNc3/PM9TXecg2sHDVCzVc3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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