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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd7c0f98b1b163e656fbb10f399d7dce6b9a0b8e0fd2ffae7886ed9f7f48832' 
  AND token = 'b/C8Xu6SxpMEqxw80c4BT/KkpEk4tSfMwHnt9wlVxTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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