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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001a6f85c2bf94cf4fdd361f1ccf695f0f0200c29b8c1139036cf5ecf001a375' 
  AND token = '7ebN2w8Hm4bw9UsUX+3RYtMow+jwlIC95K3n5W+s0MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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