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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91af2f960d44847a29499f708d9a6c5a3b1913facbe3c2c425322b9f7ac7c5a' 
  AND token = '7ncyljbRQr5cikYdCEYeUYBdJUsymQ93gg3JInLQ2RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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